// Import all the barcodes
import barcodes from './barcodes/';
// Help functions
import merge from './help/merge.js';
import linearizeEncodings from './help/linearizeEncodings.js';
import fixOptions from './help/fixOptions.js';
import getRenderProperties from './help/getRenderProperties.js';
import optionsFromStrings from './help/optionsFromStrings.js';

// Exceptions
import ErrorHandler from './exceptions/ErrorHandler.js';
import { InvalidInputException, NoElementException } from './exceptions/exceptions.js';

// Default values
import defaults from './options/defaults.js';

// The protype of the object returned from the JsBarcode() call
let API = function () {};

// The first call of the library API
// Will return an object with all barcodes calls and the data that is used
// by the renderers
let JsBarcode = function (element, text, options) {
  var api = new API();

  if (typeof element === 'undefined') {
    throw Error('No element to render on was provided.');
  }

  // Variables that will be pased through the API calls
  api._renderProperties = getRenderProperties(element);
  api._encodings = [];
  api._options = defaults;
  api._errorHandler = new ErrorHandler(api);

  // If text is set, use the simple syntax (render the barcode directly)
  if (typeof text !== 'undefined') {
    options = options || {};

    if (!options.format || options.format == 'auto') {
      options.format = autoSelectBarcode();
    }
    api.options(options)[options.format](text, options).render();
  }

  return api;
};

// To make tests work TODO: remove
JsBarcode.getModule = function (name) {
  return barcodes[name];
};

// Register all barcodes
for (var name in barcodes) {
  if (barcodes.hasOwnProperty(name)) {
    // Security check if the propery is a prototype property
    registerBarcode(barcodes, name);
  }
}
function registerBarcode(barcodes, name) {
  API.prototype[name] =
    API.prototype[name.toUpperCase()] =
    API.prototype[name.toLowerCase()] =
      function (text, options) {
        var api = this;
        return api._errorHandler.wrapBarcodeCall(function () {
          // Ensure text is options.text
          options.text = typeof options.text === 'undefined' ? undefined : '' + options.text;

          var newOptions = merge(api._options, options);
          newOptions = optionsFromStrings(newOptions);
          var Encoder = barcodes[name];
          var encoded = encode(text, Encoder, newOptions);
          api._encodings.push(encoded);

          return api;
        });
      };
}

// encode() handles the Encoder call and builds the binary string to be rendered
function encode(text, Encoder, options) {
  // Ensure that text is a string
  text = '' + text;

  var encoder = new Encoder(text, options);

  // If the input is not valid for the encoder, throw error.
  // If the valid callback option is set, call it instead of throwing error
  if (!encoder.valid()) {
    throw new InvalidInputException(encoder.constructor.name, text);
  }

  // Make a request for the binary data (and other infromation) that should be rendered
  var encoded = encoder.encode();

  // Encodings can be nestled like [[1-1, 1-2], 2, [3-1, 3-2]
  // Convert to [1-1, 1-2, 2, 3-1, 3-2]
  encoded = linearizeEncodings(encoded);

  // Merge
  for (let i = 0; i < encoded.length; i++) {
    encoded[i].options = merge(options, encoded[i].options);
  }

  return encoded;
}

function autoSelectBarcode() {
  // If CODE128 exists. Use it
  if (barcodes['CODE128']) {
    return 'CODE128';
  }

  // Else, take the first (probably only) barcode
  return Object.keys(barcodes)[0];
}

// Sets global encoder options
// Added to the api by the JsBarcode function
API.prototype.options = function (options) {
  this._options = merge(this._options, options);
  return this;
};

// Will create a blank space (usually in between barcodes)
API.prototype.blank = function (size) {
  const zeroes = new Array(size + 1).join('0');
  this._encodings.push({ data: zeroes });
  return this;
};

// Initialize JsBarcode on all HTML elements defined.
API.prototype.init = function () {
  // Should do nothing if no elements where found
  if (!this._renderProperties) {
    return;
  }

  // Make sure renderProperies is an array
  if (!Array.isArray(this._renderProperties)) {
    this._renderProperties = [this._renderProperties];
  }

  var renderProperty;
  for (let i in this._renderProperties) {
    renderProperty = this._renderProperties[i];
    var options = merge(this._options, renderProperty.options);

    if (options.format == 'auto') {
      options.format = autoSelectBarcode();
    }

    this._errorHandler.wrapBarcodeCall(function () {
      var text = options.value;
      var Encoder = barcodes[options.format.toUpperCase()];
      var encoded = encode(text, Encoder, options);

      render(renderProperty, encoded, options);
    });
  }
};

// The render API call. Calls the real render function.
API.prototype.render = function () {
  if (!this._renderProperties) {
    throw new NoElementException();
  }

  if (Array.isArray(this._renderProperties)) {
    for (var i = 0; i < this._renderProperties.length; i++) {
      render(this._renderProperties[i], this._encodings, this._options);
    }
  } else {
    render(this._renderProperties, this._encodings, this._options);
  }

  return this;
};

API.prototype._defaults = defaults;

// Prepares the encodings and calls the renderer
function render(renderProperties, encodings, options) {
  encodings = linearizeEncodings(encodings);

  for (let i = 0; i < encodings.length; i++) {
    encodings[i].options = merge(options, encodings[i].options);
    fixOptions(encodings[i].options);
  }

  fixOptions(options);

  var Renderer = renderProperties.renderer;
  var renderer = new Renderer(renderProperties.element, encodings, options);
  renderer.render();

  if (renderProperties.afterRender) {
    renderProperties.afterRender();
  }
}

export { JsBarcode };
